A Sensorless Control Solution for DCT Oil Pump with BLDC Motor

Paper #:
  • 2017-01-1631

Published:
  • 2017-03-28
Abstract:
Double Clutch Transmission system becomes more and more popular in vehicles because of the fuel saving performance, cost efficiency and comfortable feeling during gear change. To save fuel consumption, oil pump can be used for oil pressure on demand control. Sensorless control has cost advantage because it removes the motor position sensor. This paper will introduce a technical solution for BLDC (Brushless DC) motor sensorless control for oil pump used in DCT system. To implement sensorless block commutation of BLDC motor, usually Back-emf voltage needs to be compared with a reference voltage. A `zero-crossing point’ of the Back-emf voltage can indicate the rotor position, and hence motor can be controlled without position sensor. Phase feedback pins of Infineon pre-driver device TLE9180 provide these `zero-crossing point’ information based on hardware. The outputs of phase feedback pins are connected to a module CCU6 (capture compare unit6) from 32bit micro-controller Aurix. This module is specially designed for 3-phase motor control and offers critical features such as Hall input signals sampling and filtering, block commutation control, and etc.. Oil pressure control is fulfilled by a speed controller of the oil pump motor. Some critical control requirements for the oil pumps are short and reliable startup stage, stable and accurate speed control regardless of sensorless control or not. This paper will elaborate on the difficulties of oil pump sensorless control, and how to solve these difficulties and also implementation based on Infineon micro-controller and pre-driver devices.
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